Study of Scrape-Off-Layer Width in Ohmic and Lower Hybrid Wave Heated Double-Null Divertor Plasma in EAST

摘要

Edge profiles in Ohmic and lower hybrid(LH)wave heated discharges in EASTare presented.A comparison of the measured profiles is made with those from the theoreticalprediction for the scrape-off-layer(SOL)width.The edge plasma parameters are diagnosed bya triple probe divertor diagnostic system and fast reciprocating probes at the outer mid-plane.The experimental results show that the SOL width of double-null(DN)divertor plasmas in EASTappears to exhibit a negative dependence on the power crossing the separatrix,which is consistentwith the collisional SOL scalings of JET and Alcator C-Mod.This will provide useful informationfor extrapolation to the ITER SOL width scaling for power deposition.